Crank-shaft.



H. L. BUCK.

CRANK SHAFT.

AAPPLIUATIOH FILED APE.10, 1911.

Patented June 3, 1913.

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W/TNES'EE'E' H. L. BUCK.

CRANK SHAFT. APPLICATION FILED APR.10. 1911.

1,063,328., Patented June 3, 1913.

6 SHEETS-SHEET Z.

H. L. BOOK.

CRANK SHAFT. APPLIQATION FILED APR.10.1911.

1,063,823, Patented June 3, 1913.

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CRANK SHAFT.

APPLICATION FILED APR.10,1911.

Patented June 3, 1913.

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- .H. L. BOOK.

CRANK SHAFT.

V 1911. 1 063,323. Patented June 3,1913.

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CRANK SHAFT.

APPLICATION FILED APR.10,1911

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Patented June 3,1913. Q

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HENRY I BOCK, OF TOLEDO, OHIO, ASSIGNOR T WILLIAM E. BOCK, 0F TOLEDO, OHIO.

enema-snare To all whom it may concern:

' Be it known that I, HENRY L. Boon, a

. citizen of the United States, and a resident of Toledo in the county of Lucas and State of Ohio, have invented a certain new and useful Crank- Shaft; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention" relates to the manufacture and construction of crank-shafts for engines or power transmitting appliances; and has for its object the provision of a stamped or drawn sheet metal crankshaft, which is strong and durable in its construction, ineX- pensive of manufacture, and light of weight, and which hasthe parts thereof so assembled and formed as to combine a maximum of strength and durability with a minimum of lightness and cost of manufacture.

A further object of my invention resides in the interengaging 0r uniting of a crankshaft and fly-wheel in such manner as to provide a strong, durable and efficient connection between such parts, which is cheap and simple of construction.

- The invention is fully described in the following specification, and while, in its broadef'aspect, it is capable of embodiment in numerous forms, a few only of such forms are'illustrated in the accompanying drawings, in which, I

Figure 1 is a side elevation of a preferred form of my invention with a portion in central longitudinal section. Figs. 2 and 3 are inner face views, respectively, of the outer and inner sidemembers of a crank-arm, Figs. 4 and 5 are edge views thereof, respectively. Fig. 6 is a cross-section on a line a: w in Fig. 1. F 7 is a side elevation of another form of the invention with a portion in section.- Fig. 8 is a section on the line 3 y in Fig. .7. Fig. 9 is an edge view of the outer side piece of a crank arm. Fig. 10 is an inner face view of the inner side piece of a crank-arm. Fig. 11. is an edge view thereof. Fig. 12 is a section on the line 1; v in Fig. 7. Fig. 13 is a side elevation of another form of the invention, with a portion in section. Fig. 1% is a cross-section on the "line w w in Fig. 13-. Fig. 15 is an edge view of the outer side piece of a Specification of Letters Patent.

. Patented June a, 1913.

Application filed April 10, 1911. Serial No. 620,214.

crank of. such form. Fig. 16 is a cross-section on the line 23. t in Fig. 13. Fig. 17 is a side elevation of another form of the invention with a part in section. Figs. 18 to 25, are details of the parts thereof. Fig. 26 is a side elevation of another form of crankshaft, with a portion in section. Figs. 27 to 32 inclusive, are details .of parts .of the same, and Figs. 33 and 34 are a partial longitudinal-section and a cross-section of another form of the invention.

' their inner or shaft ends outwardly, as the shaft is customarily larger in diameter than the wrist-pin.

The male member 1 is shown as being formed with a marginal inwardly projecting flange 3, within which the female part 2 is intended to fit, and has at the shaftend tliereof an outwardly drawn cylindrical cupshaped portion 4, which cooperates with a like part of the adjoining crank and with a sleeve 5 to form the portion of thecrankshaft connecting two adjoining cranks. The'ends of the adjoining drawn shaft pants 4 are riveted, welded or otherwise rigid y secured together, and are preferably closed except for registering openings (3 therein through which oil may circulate. The flange 3 preferably projects from an outwardly drawn marginal portion 7 of themember 1, which portion strengthens said member and provides an inner marginal channel or recess 8 therein. The member 1 also has a curved transverse ridge 9 drawn outwardly therefrom adjacent to the part 4.

and concentric thereto to cooperate with a,

I depth arm the member 2 preferably has a longi-- tudinallyextending centrally-disposed rib 12 struck inwardly therefrom relative to the companion member in position to span the open end of the shaft part t thereof and to abut against the body of said member at opposite sides of said, part. From the outer or small end of the member 2 is'drawn, stamped or otherwise suitably formed a laterally projecting cup-like part 13, which is cylindrical in form, or substantially so, and cooperates wit-h a similar part of the opposing crank-arm of the )air and with the encircling sleeve 14; to form the wrist-pin of the crank. The adjacent ends of the cooperating parts 13 abut and are preferably closed except for registering oil-circulating openings 15 thercthrough to strengthen the pin and facilitate a riveting, electric welding or otherwise securing of the two parts together, as is apparent. length. to the combined lengths of the parts 13, and has its ends flanged outwardly, as at 14:, against the members 2.

Secured to the crank-shaft in a manner similar to the connection of the sets of crank-arms,thcreof is a fly-wheel, which is shown in the present instance as comprising the opposing stamped sheet metal side or web portions 16, 16 and the cast rim portion 17 rigidly secured thereto. If the flywheel is attached at only one side to the crank-shaft, as in the present instance, the side 16 thereof which is adjacentto the crank-shaft end is provided with an out"- wardly drawn or otherwise suitably formed axial projection 18 which is similar to the part 4 of the adjoining crank-arm and co operates therewitl'i and with the associated sleeve 5 to form a crank-shaft section in the same manner as do the parts 4 of adjoining crank-arms and the incasing sleeve 5. The projection 18 is also secured to the adjoining arm part 4 by riveting, welding, or in any other suitable manner. It is evident that this forms a simple, strong, durable and rigid means of connecting a crank-shaft and fly-wheel, and that in case of an extension of the crank'shaft from both sides of the wheel the shaft can be attached to both sides 16 thereof in the same manner.

In the crank-sl'laft shown in Figs. 7 to 12, inclusive, 21 and 22 dcsignate the male and female members, respectively, of a crank-- The. sleeve 14 is equal in arm and telescope one within the other, be ing secured together in thesa-me manner as described forFigs. 1 to G inclusive. The form of the female member 22 and wristpin 23 of a crank are also the same as described for said figures. In this form of the invention the male member 21 is not drawn at its inner or shaft end to provide an integral shaft part corresponding to the part 4: of the former construction, but is provided in lieu thereof with a socket or depression 2a, the wall of which is formed by the cross ridge 25 and inner end portion of the marginal ridge 26 on the outer side of said member.

The shaft sections 27, which are disposed between the cranks, are of tubular form and have their ends flanged outwardly, as at 28, and fitting snugly within the sockets 24 of the respective members 21, being rigidly united thereto by or in any other suitable manner. To strengthen the point of uriion of the parts 21 and 27 against shearing stresses, the edge of the flange 28 and wall of the socket 24 are of like polygonal form, or of other than a true circle, so that one must turn with the other irrespective of the uniting means, as is apparent. An opening 29 is provided in the member 21 in register with the interior of the associated shaft section 27 for oil to circulate through.

The ribs 22 on the members 22, which ribs correspond to the ribs 12 in the form shown in Figs. 1. to 6, inclusive, extend across the openings 29, in abutment with the members 21and permit the oil to flow at either side thereof through said openings and between the members 21, 22, as best shown in Fig. -1 2.

In Figs. 13 to 16,-inclusive, is illustrated a simpler, but not so strong and durable, a form of the invention as those above described. In this form 31- and 32 designate the male and female members or outer and inner parts, respectively, of a crank-arm. The member 81 has the marginal flange 33 within which the marginal flange 34 of the female member fits, the edge of theflangc 33 being rolled around the edge of the female member to unite the two members, as shown. The member 31 is provided at its inner end portion with the outwardly drawn cylindrical cup-shaped part 35, which has its outer end closed, except for an oil circulating opening 36 therein, and rigidly secured in a suitable manner to the outer end of a similar part on the member .31 of the adjoining crank-arm and with an encircling crank connecting shaft section, for the form first above described. wrist-pins of the cranks are also formed in a manner similar to, said first shaft form by rigidly connecting thc,drawn parts 38 of the cooperating crank-arm, members 82 and sleeve 37 to form a as described riveting electric welding,-

to cooperate therewith The . encircling such parts with a sleeve-39. It

will be noted that in this form of the invention the members 31 and 32 lack the'reinforcing ribs or depressions provided on the members 1 and 2 of the first form.

In the form of the invention shown in Figs; 17 to 25, inclusive, the crank-arm members 41 and 42 are similar in shape to and secured together in the same manner as the members 31 and 32 of the proceeding form, but the construction of the shaft sections and wrist-pins differs from those of the above described forms. In this form a member 41 of one crank has a shaft part 43 drawn out wardly or otherwise suitably formed thereon and telescoping within a similarly drawn part 44 of the adjacent member 41 of the adjoining crank. said parts 43 and 44 being each substantially equal in length to the shaft section formed thereby. The outer end of the outer part 44 is outwardly flanged, as at 45, and riveted, welded or otherwise suitably secured to the portion of the member 41 against which it abuts, while the outer end of the part 43 is preferably closed except for an oil circulating opening 46 therein, which opening is in communication with the space between the members 41 and 42 of the adjoining crank-arm, as shown. A ring or collar 47 encircles the inner end of each' .part 44 inf'abutment with its member to reinforce such end of the shaft sect-ion and render it similar in appearance to the opposite flanged nd of the section. The wristpinis similarly constructed in that one member 42 of a crank is provided with the later-- ally drawn ,or otherwise suitably formed tubular part 48 which is nearly closed at its outer end and telescopes within a similar open ended part 49. The parts 48 and 49 are substantially equal in length to the length of the wrist-pin. and the latter has'its outer end flanged and suitably secured. to the abutting member 42. A ring 50 encircles the part 49:11; the inner end thereof.

In Figs. 26 to 32, inclusive, the shaft sections and. wrist-pins of the crank-shaft are shown as being formed of tubular parts, which are separate from the crank-arm members but securcdto the respective ones thereofby' electric welding or in any other suitable manner. In thisform, 51 and 52 are the outer and inner crank-arm members,

respectively, which are flanged at their edges to enable them to be secured together as described for the above forms, 53 the parts forming the shaft sections, and 54 the parts .7 forming the wrist-pins. Each of the pa ts 53 and 54 comprises a tubular section, which has its ends radially flanged, preferably outwardly, and electrically spot of scam welded to the abutting face of the member 51 and 52, as the case may be, as shown at 55, or secured thereto in any other suitable .manner.

In the form illustrated in Figs. 33 and 34 encircles the parts 64 and 65 to give the the crank-arms, the wrist-pins and the- .crank-shaft sections are substantially the same in construction as shown in Figs. 17

to 25 except that the telescoping parts of the wrist-pins and crank-shaft sections are of corresponding polygonal formin' crosssection to lock them against relative turning movements and are encircled by cylindrical sleeves to provide circular exteriors. In these figures the cranlearnis are shown as comprising the inner and outer members 60 and 61, respectively, which are formed on their respective edges in the present instance, with the interlocking male and female flanges 62 and 63.. The outer members 61 of the contiguous arms of adjoining crank-arm sets are formed adjacent one end with the outwardly drawn telescoping parts 64 and 65, which are of corresponding polygonal shape in cross-section and fit closely 35 one within the other, as shown, to prevent a relative turning of such parts. The inner part 64 has its outer end preferably closed and abutting against the inner side of the member 60 of the adjacent crank-arm and riveted or otherwise rigidly secured thereto. The closed end of such parts also has openings 66 opening into the oil-circulatin space within the crank-arms. A sleeve 6? shaft section thus formed a circular exterior. The wrist-pins are similarly formed by providing the outer ends of the adjacent crank-arm members with the polygonal telescoping parts 68 and 69, the inner of 1 0 which has its end preferably closed and rigidly secured in abutment with a coacting crank-arm member 61. A sleeve 70 encircles said parts.

Experiment has demonstrated that c crank-shaft of the nature described and illustrated will withstand very much greater twisting or crank-shaft stresses than will the crank-shafts commonly employed in automobile engines or .the like. A shaft of this nature, however, in addition to being exceedingly strong in construction'is also inexpensive to manufacture and is very much lighter than the ordinary shaft, thus materially enhancing its practicability'and commercial value. The hollow form of the shaft also enables oil to be freely circulated therethrough.

It is apparent that any one of the forms shown and described provides a crank-shaft which is not only strong, durable and simple in its construction, but light of weight and inexpensive of manufacture, thus admirably adapting it for use in the engines of a1itomobiles, power boats, or for other purposes where lightness, strength and durability are essential. It is also apparent that the costof repair of a shaft. of this nature is reduced to a minimum, as a broken crank-arm, wristpm or shaft section may be replaced with 'ISO little trouble and expense, whereas the breakcircling ing of a part of a crank-shaft of ordinary form usually requires the substitution of an entirely new shaft therefor.

\Vhile I have shown a particular arrangement, construction and manner of uniting the parts of each form of the invention, I wish it understood that such forms are merely illustrative of the broad idea of the invention and that the invention is not limited to any specific constructimi, ar'angement or manner of securing the parts together. except in so far as such limitations are specified in the claims, and also that a fly-wheel and crank-arm can be connected in the same manner as illustrated in thel modifications for the connecting of the crank-arms of adjoining sets.

Having thus described my invention, what I claim as new and desire by Letters Patent,

posed of inner and outer rigidly connected 'heet metal members, one having a portion drawn outwardly to form a shaft part and the other having a portion drawn outwardly to form a wrist-pin part.

2. A crank-shafthaving a multiple section'sheet metal crank-arm, the sections being secured together to form a space therebetween, and one section having an outwardly drawn hollow wrist-pin part in communication with such space.

3. A crank-shaft having a multiple section sheet metal cranlearm, the sections beings secured ogether to form a space therebetween, and one of said sections having an outwardly drawn hollow shaft part in communication with such space.

4. A crank-shaft having a' multiple section sheet metal crank-arm, the sections being seciifed together to form a space therebetwen, one of said sections having an outwardly drawn hollow shaft part and another having an outwardly drawn hollow wrist-pin part, with each of said'parts in communication with said space.

5. A crank-arm comprising an inner member of sheet metal, and an outer member of sheet metal partially inclosing said inner member, one of said members being provided with a tubular portion integral with it and constituting a shaft-part, the other member being provided with a tubular pora 1. A crank-shatt having a crank-arm comsaid parts and forming therewith a wrist-pin.

T. The combination of a composite rrank arm built up of sheet. metal members, one of G-i said members partially inclosing another. said crank-arm thus Formed being provided with a. passage extending throughout its length for the purpose of promoting a flow. of oil therethrough, said ci'ank-arm-being provided with a portion extending from it and formed into a shaft part, said crankarm being further provided with another portion extending from it and formed into a wrist-pin part, said wrist-pin part and said sha't'l part being provided with holes communicating with said passage in said crankarm for the purpose of promoting the flow of oil into and out of said passage.

8. A crank shaft provided with a crank arm, said crank arm being built up of an 'r inner portion of sheet metal and an outer portion of sheet metal partiallyjlinclosing said inner portion, one of said portions being provided with a wrist pin part and the other of said port-ions being provided with a' shaft part, said shaft partand said wrist pin part being provided with openings to facilitate the travel of a lubricant through said crank arm, said shaft part and said wrist pin part.

9. A crank arm for a composite crank shaft comprising a pair of interfitting plates providing a chamber therebetween, each plate having an outwardly hollow projection in communication withsaid chamber, each projectionbeing adapted to abut and to be secured to the corresponding projections of adjacent crank arms whereby to provide shaft and wrist pin parts, said pro]ect-ions having openings through their outer ends whereby to provide an open passage through the crank arm. 1

10. A composite crank shaftcomprising a; plurality of hollow crank arms,

shaft and having openings in their outer end whereby to establish communication between all of the crank arms of the crank shaft.

In testimony whereof, I have -hereunto sigu d my name to this specification in the presdnee of two subscribing witnesses.

HENRY L. BOOK.

t \Yitnesses:

2 3. W. Owen,

i H. Bums. 

